Apparatus for diascopic projection



Dec. 9, 1941. Li N. MEsRE APPARATUS FOR DIAS-COPIC PROJECTION Fled April 27, 1959 2 Sheets-Sheet 1 i Figi IIHI j 9, 1941. L. N. MESTRE 2,265,182

APPARATUS FOR DIASCOPIC PROJECTION Filed April 27, 1939 2 SlleetS--fslleelll 2 Fig] Patented Dec. 9, 1941 Arrm'rus Fon amas: Dmscorlc rnomc'rroN Louis Nicolas Mestre, Paris, France, lassigner* to- Anciens Etablissements Barbier, Benard .Tnrcnnc, Paris, France. a company of France Application Claims.

My invention relates to apparatus for the telescopic projection, i. e. adapted to the projection of transparent elements such as for instance microscopic preparations, positive and negatives', .or the like.

One of the objects of my invention is a supporting plate adapted to carry a number of transparent elements, disposed to be successively brought into a position centered on the optical axis of the apparatus to be optically projected by transparency and arranged to allow the orientation of said elements to be readily elected.-

A further object of my invention is to provide in cooperation with a such' supporting plate a system of markings designed to allow the easy puttingv in place of the transparent elements without proceeding by trialsand errors.

The supportingplate according to the invention is provided with a number of preferably removable preparation carriers, each separately supported by said plate to be rotatable upon itself and provided with a central light passage and with means for removably holding a transparent anni zu, issaseriai Nc. 210,411 France November 30, 1936 v (vigas- 40)V drawings, given solely by way which:

Fig. V1 is an elevation of an apparatus for opticai projection according to an embodiment, the supporting plate being cut along line I-I of 1` Fis- 2:

element above said passage, said supporting plate r being movable to allow the light passages of the said'carriers to be successively brought into a position centered upon the optical axis of the optical projection apparatus.

In a preferred embodiment, said supportingv plate is movable about a preferably vertical axis, said preparation carriers being distributed about said axis to form a circular row.

Said supporting plate is advantageously movable parallel with' the optical axis of the appat ratus responsive to an appropriate control enabling focussing to be effected readily.

A further object of my invention is to enable transparentelements of large area'to be projected lin continuous parts and, for this purpose, at least one of said preparationcarriers is provided with a sliding carriage arranged to carry said transparent element any part of which is thus adapted to bebrought above the light passage provided in the preparation carrier.

The supporting plate is preferably combined with micrometer control'means adapted to selectively displace'it i'n two directions, so as to finely F g. 2 is a partial corresponding plane view of the supporting plate; l

Figs. 3, 4 and 5 are partial enlarged sections along lines III-III, IVF-IV and V-V of Fig. 2:

Fig. 6 is a'partial sectional elevation of a modv cation of the embodiment shown onFig. 1;

Fig. '7 is a corresponding plane view with parts Cut away;

- Fig. 8 is an enlarged partial section along the line VIII- VIII of Fig. 7.

.According to the embodiment shown on Figs. 1 to 5, the apparatus comprises a frame I carrying at its lower partY an illuminating system comugated with an optical system of vertical optical axis 2 and provided withl a bracket 3 supporting an optical amplifier system 4 centered on the axis 2 and adapted to project onto a screen the image i of a transparent element suchas .a preparation thus illuminated.

A. circular horizontal supporting plate 8 is carried by the frame I by means of asupport 5 lbetweensaid two optical systems. The plate 6 is mounted for rotation about the axis I of a vertical pivot v8 and is adapted to carry a number of transparent elements such as preparations, distributed about the axis 1 adapted to be successively` brought to a centered position on the axis 2 by adjust-the centering of the transparent elements,

rotating the plate 6 on^itself, in order to be optically projected by transparency,

'Ihe said transparent elements are carried by the supporting plate 6 by means of removable preparation carrier' discs I0 arranged in recesses 9` provided in the upper surface of the plate 6. Each of said preparation carrier discs I0; on which' a transparent element II is shown fixed through'the instrumentality of springs l2, has a central opening I3\adapted to bei centered on the optical axis 2 and can rotate on itself in the'plate 6, such rotation being controlled by a knurled knob I1 or by knurledl portions provided inthe upper surface of the carrier disc. The position of each preparationcarrier II) relatively to the plate 6 is marked by graduations I4 or marks on its periphery co-operating with a mark I5 made on the lupper surface of the plate 6 or by any other sys--l y -fparent element I I on its carrier disc l0 is marked by means of two perpendicular radial lines I6 'of example and in l corresponding to radii marked slide. to the rotation of a screwed rod l2 (Figs. I and on the element l I. The same element II-or preparation can have a plurality 'of polar radii of different colours for example and relating to a plurality of parts to -be projected. No hesitation can thus occur.

The plate 8 is mounted on the pivot l through the 'intermediary of its cup-shaped central part -II at thebotton'i of which'bears a springi I! which bears on the other hand against a collar 2l of the pivot I. The plate I carries on its peripl'ieryone or a' numberof knurled knobs. 2i enabling its rotation to be controlled. yThe plate l rests on a support plate 22arranged below it 'and relatively to which it 'can rotate. -Therelativepositlons of-jthe two plates C and 22 corresponding to tliecentering on the axis 2 -of the 'successive'carriers Il are marked by means' of 1. 2l provided in the lower surface v.of the plate l and co-operatingl with a'projection 2l`-(Fig. 5) arrangedin a housing 21`provided in the supportplate 22 and equidistsnt conical y urged by a spring 2K in the direction of the lower surface yoil the plate l.-

= -The lower endof the pivot luis carried -by a `slide 29 mounted in va. dove-tailed housing 3l (Fig. 3).` provided in the frame I in a radial di-y i rection relatively to the plates l and 22.

, The :length of the displacement of the slide 2l along its housing 2l is limited by a screw 4I of which the head is in a groove l2 provided in said Said displacement is eifected responsive :2), screwed'into a hole M provided in said slide 22, the rotation of said rod Il being controlled bva knurledknob 4I arranged on the outside within reach of the operators hand. A ring is pinned onto-the rod l and has a conical recess `41 co-operating with a projection 48 carried by the frame I and resiliently pressedag'ainst the ring 4l, the recess 41 being arranged in'such a manner that the projection 42 penetrates thereinl at the mean position of the carriagev 28 and thus 'serves as a zero mark.

s second screwed rod u (Figs. 2 and 4)' terminated by a knurled knob I! is carried by the frame I and co-operates with a nut II carrying a projection sz sliding in a nonrsdial housing o:

provided in the plate 22 so asto cause said plate to rotate slightly by displacement of' the said nut II Aalong the rod Il. This latterrod carries in a similar manner tothe rod 43 a ring Il .or the like having .a conical recess ii co-operating with a spring pressed projection Il carried by the frame I and forming a zero mark.

yIt will be understoodthat the rotation -of the 'plate 6 relatively to the support plate 22 bymeans of 'the knurled knobs2l between two stoppagesl caused by the projection 25 penetrating into two successive notches 24,' substitutes one preparation or the like for. another on the optical axis 2, the adjustment of its exact position longitudi-v nally .and angularly being eil'ected by the knobs 4l and 42 moving the -two plates 22 and Ifin The' adjustment of position lcfthe transparent elements is lthus accurately effected. 1 The support l is'socan'ied by the frame I that it is adapted to be displaced together with the plate in a direction parallel with the vertical opticalaxis 2. "For that purpose,`the lower part of the support I carries Aa rack l1 slidably mounted in a vertical guide l2 .provided in the frame I. The rack I1 cooperates with a toothed wheel Il iixed on a rotary horizontal rod Ol -ss by-the frame I and 3,265,182 f .A A A carriedby the frame I and terminating in an vI5 and 6l have been shown terminating in square portions Il', 40', Il', that are intended to be coupled to remote controls by means of servomotors which may be hydraulic, pneumatic or 'electricand which enable all the operations to be controlled at distance., In the case of the use of such a remote control, the knurled knobs Il,

4I, Il may of course be eliminated.

Figs. 6 to 8 relate to a modiilcation of the preparation-carrier plate I which is shownv restg5 ing on a ring-shaped faced horizontal surface.

as in the previous example, on a pivot l of which p 1 is the axis, by means of its cup-shaped central portion on'the bottom of which bears a spring 'II which surrounds the pivot 2 and the other end of which is in contact with a collar 2l `terminating said pivot. The pivot I is carried by a carriage Il at the top of which is mounted an expansion il embracing an annulus II of which the axis is 'I and which-is located at the lower part of'the plate i. A ball ll'is pressed by a spring Il against said annulus which is provided with a number of notches 1l which correspond to the various operative positions of the 40 plate C (four in the example shown) and which v are thus located. The carriage Il is slidablymoun'ted in a4 horizontal groove 12 of dove-'tail .shape and is provided with a tapped hole 13 `parallel with the groove v12 andinwhich is engaged 4 5/a thread provided on a rotary rod 1l which is carried by the frame I and terminates in an operatingknob.A s The horizontal groove 12. is itself provided in a carriage 1I, the lower part of which is slidably mounted in a-horizontal vgroove 1l of dove-tail shape perpendicular to the groove 12. The carriage 1l is likewise provided with a tapped hole Il parallel with the groove 12 co-operating with a threaded portion oi' a rod 2i which is carried terminates in a knurled operating knob l2.

It will be understood that, under these conditions, the micrometric-control means actuated by the knobs 1I and I2 -enable the plate l in be moved on the faced surface l2 and. consequently,

its position to be accurately adjusted.

As in the previous example, the plate l is proi vided with a number of circular openings l, shown as beingfour in number, which form guide surfaces carrying preparation carriers Il which are each provided with a central opening I3 and carry a retaining spring I2 for a slide or the like'. As shownin Fis. 6, said preparation carriers Il I project from the upper surface of the plate l and their bevelled periphery is provided with `graduations Il opposite a mark Il provided on the surface of the plate I.

In order to enable transparent objects of large area to be projectedfone of the preparation carrier discs '.Il. shown in `section in Fig. 8,.carries Furthermore the various actuating rods l2, Il

formed on the frame I. The plate 6 is mounted,

L a support 8l for a carriage 85. Said ,carriage 85 is adapted to slide'radially, this sliding being controlled by a rod l8'I terminating in a knob 88 anducarrying a gear 80 which meshes with a rack 9| provided. in the carriage 85. The carriage 85-carries the retaining system I 2 for the transparent element to be projected.

A It is thus possible, with a very slight projecltien above the4 surface oi the plate, which en ables the objectives to be kept near said surface, to explore longitudinally a slide or the like of great length.

v Finally, in order to prevent an abnormal heating oi the preparations during projection, the

Lframe I carries under the plate 6 and adjacent the axis 2 of the luminous beam, a nozzle IBB which is connected to a source of compressed air and is directed in the direction oi the transparent element vthat is centered on said axis and thus in the projection position. i

While I have described what I at present consider preferred embodiments oi my invention,` it

will be ,obvious to those skilled in the art that various changesl and modifications may be made Without departing from my invention and I therefore aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of my invention.

What I claim is:

1. An optical apparatus supporting stage for a pluralityoi transparent objects such as microscopic specimens, which comprises a plate, a plurality of discs rotatably mounted in spaced relation on ene face of said plate, each of said discs having a central light passage therein, means for 2. An optical apparatus supporting stag\e for am, plurality' of transparent objects such as microscopic specimens which comprises a plate, means mounting said plate ior rotation about an axis perpendicular to its surface, a plurality of di`scs rotatably mounted in spaced relation on one iac of saidplate, said discs being distributed about said axis to form a circular row, each of said having a central light passage therein, means for holding a transparent element lalcove said passage, said plate also having a light passage extending therethrough and coaxialwith each of said centrallight passages of said discs said plate also having a light passage extending holding a transparent element above said passage, said plate also having a light passage ex-l tending therethrough and coaxial with each of said central light passages ci saidfdiscs respectively and -means for mounting said plate for `movement to enable said light passages to be brought successively substantially into register with the optical axis of said optical apparatus.

respectively. 4

3. An optical projection apparatus supporting stage for a 'plurality of transparent objects such as microscopic specimens which comprises a plate, a plurality oi discs rotatably mounted in spaced relation on one face `oi `said plate.. each of said discs having a central light passage, a carriage mounted to slide radially with reference to at least one oi said discs, supporting means forV said carriage rigid with said last namedV disc,

said carriage being provided with a light opening and being arranged to carryva transparent object,

said plate and coupling means adapted to couple said mechanism to a remote control.

Louis NICOLAS MESTRE. 

